Patent DE-19606879-A1 (DE)
Title: Mfr. of alkali secondary battery with good high current discharge characteristics
Inventor: HASEBE HIROYUKI
IPC: H01M4/24
Filed: 1996-02-23
Abstract: Process for mfg. an alkali secondary battery with a positive anode (2), which contains a Ni cpd. and a Co cpd., a negative cathode (1) and an alkali electrolyte by initial charging in a charging process by supplying a current I (mA) satisfying inequality (1): 50 < (T \* C<2>) / (I \* S) < 2000 (1) C = an electrochemical capacity (mAh) of the Co cpd. contained in the anode (2) calculated on the basis of an electrochemical equivalent of the Co cpd.; T = temp. ( deg C) at which the charging process is carried out; and S = surface area (cm<2>) of the anode (2). Also claimed are: (A) a further process for mfg. an alkali secondary battery comprising the above method followed by reducing a temp. according to which a charged amt. of current Q (mAh) reaches a value of the following inequality (3): 0.1 < Q / C < 3 (3); (B) a further process for mfg. an alkali secondary battery comprising the above method followed by increasing the current according to which a charged amt. of current Q (mAh) reaches a value of the following inequality (3): 0.1 < Q / C < 3 (3); (C) a further process for mfg. an alkali secondary battery comprising the above method followed by reducing a temp. and increasing the current according to which a charged amt. of current Q (mAh) reaches a value of the following inequality (3): 0.1 < Q / C < 3 (3); (D) an anode (2), contg. a Ni cpd. and a Co cpd., for an alkali secondary battery, assuming the Co cpd. to be C oxyhydroxide having an electrochemical capacity, calculated on the basis of an electrochemical equivalent of the Co oxyhydroxide, is equal to C (mAh), then, when the anode (2) is charged with a current of C / 100 (mA), the anode has a discharge capacity of C / 20 (mAh) or greater, while an anode potential falls from 200 mV to -200 mV w.r.t. a Hg / Hg (II) oxide reference electrode; (E) an alkali secondary battery having the above anode (2), a cathode (1) and an alkali electrolyte; (F) an alkali secondary battery having the above anode, a cathode and an alkali electrolyte where in the case that the Co cpd. is Co oxyhydroxide, on discharge of the battery at 45  deg C by carrying out a short circuit using a 2 OMICRON  resistance, the battery has a current, which flows while a voltage falls from 100 mV to 20 mV and which is not less than 20% of an electrochemical capacity of the Co oxyhydroxide, calculated on the basis of an electrochemical equivalent of the Co oxyhydroxide; (G) an alkali secondary battery having anode, cathode and alkali electrolyte, the battery having a recovery voltage, which climbs from 20 mV to 30 mV within an hour or less after discharging the battery at 45  deg C after short circuiting the battery using a 2  OMICRON resistance for 48 hrs. and then taking away the short circuit at 25 deg C; and (H) a method for producing an initially charged alkali secondary battery by providing an alkali secondary battery having anode, cathode and alkali electrolyte, initially charging the battery at 40 - 120  deg C, and then carrying out heat exchange between the initially charged battery and a battery to be initially charged, thus cooling the charged battery and heating up the battery to be charged.